1305630666021 has 8 divisors (see below), whose sum is σ = 1899099150624. Its totient is φ = 791291312720.

The previous prime is 1305630666013. The next prime is 1305630666047. The reversal of 1305630666021 is 1206660365031.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1305630666021 - 2³ = 1305630666013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305630666121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19782282786 + ... + 19782282851.

It is an arithmetic number, because the mean of its divisors is an integer number (237387393828).

Almost surely, 2^{1305630666021} is an apocalyptic number.

1305630666021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1305630666021 is a deficient number, since it is larger than the sum of its proper divisors (593468484603).

1305630666021 is a wasteful number, since it uses less digits than its factorization.

1305630666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39564565651.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 1305630666021 in words is "one trillion, three hundred five billion, six hundred thirty million, six hundred sixty-six thousand, twenty-one".